Furnace.



F. S. LANG.

FURNAGB.

APPLIGATION FILED JUNE 5,1908.

925,486, Patented Julie 22, 1909. 2 SHEETS-SHEET 1.

f//I/l/'ll'fillgf y Ir MII f// Y l ,22 A 1N VENTOR.

A TTORNE YJ F. S. LANG.

FURNAGE.

APPLIOATION FILED JUNE 5,1908.

925,486, Patented June 221909. f

2 SHEETS-SHEET 2.

wg/maggy ATTORNE YJ FRANK S. LANG, OF SEATTLE, WASHINGTON.

FURNACE Specification of Letters Patent.

Patented June 2.2, *1909.

Application led June 5, 1908. Serial No. 436,934.

To all whom it may concern:

Be it known that I, FRANK S. LANG, a citizen of the United States, residing at 902 First avenue, S. Seattle, in the county of King and State of Washington, have invented a new and useful Furnace, of which the following is a specification.

This invention has relation to furnaces and it consists in the novel construction and arrangement of its parts as hereinafter shown and described.

The object of the invention is to provide a furnace especially adapted to be used for heating air and which is so arranged as to coke the fuel and burn the resultant gas and fuel without smoke. The fuel is burned from the top to' the bottom of the fire `pot and is completely consumed. The lire pot is provided with a central air tube open at its upper and lower ends which serves as a means for leading air above the fuel and also as a dust passage when the fire is raked.

A great saving may be effected by the use of the present invention as an inferior grade of fuel may be burned and in fact the lower grades of coal produce greater quantities of gas and consequently serve as an admirable fuel.

In the accompanying drawings Figure 1 is a vertical longitudinal section of the furnace. Fig. 2 is a perspective view of the grate devices, and Figs. 3 and -l are horizontal sectional views taken on planes 3-3 and 1-1, respectively, of Fig. 1.

The base section 5 is divided by a partition 6 to afford a centrally disposed ash-pit 7 and an air receiving chamber 8 thereabout. This chamber 8 is open, as at 9, at the top to allow of the upflow of air into the space inclosed by the heater casing 10. Seated in journal bearings provided upon diametrically opposite sides of the partition 6 and in proximity of the top are trunnions 11 of a circular grate member 12 having radial arms which may be formed integral with the hub 13 and its rim 14e. From this rim is a depending lug 15 arranged to enter a loop shaped attachment 16 at the back side of the partition for the purpose of making locked engagement to prevent the turning of said grate-member when shaking the other grate-member 17 and at the same time allow the tilting of the grate for dumping purposes.

The grate-member 17 is the counterpart of the member 12 with similar radial arms, a rim, and a hub 18 but ,is seated for rotation upon the member 12 by having its hub 18 extend through the hub 13 of the other and is rotated by a shaker bar 19 having one end socketed in the hub 18 and extending through a lug 19 upon the rim of the upper member and thence through a slot 2O it protrudes outside of the heater. Below this slot and communicating therewith is an opening 21 in the peripheral wall of the said base section and through which communication is had with the ash-pit.

22 is a door for the opening 21 and directly above the slot 2O is another opening with a door 2dr for the insertion of a slice-bar (not shown) for cleaning elinkers from the top of the grate-member 17 and to accommodate such bar the grate is positioned at such an elevation as to provide a space 25 between the grate top and a ledge above which supports a fire pot 27. Socketed within the grate hub 18 is an upwardly extending tubular member 28 which is open at the bottom and closed at the top and adjacent the latter it is provided with a plurality of holes 29. These holes are disposed to be above the top of the charge of fuel which is proposed to be employed and they serve to supply air to combine with the gases emanating from the bed of coal to effect the complete consumption of the combustible gasesthereof. Said fire-pot is desirably made of increasing diameter toward the top in order to sustain part of the weight of the fuel and prevent its packing as would be the case if it were borne by the grate alone, and also to present a large surface for the separation of the gases from the fuel.

Exteriorly of the fire-pot are radially directed hns 30, and supported in a circumferential groove provided about the top edge of the lire-pot is a conical shaped hood 31 provided eXteriorly with radially directed [ins 32. This hood is provided at the front with a passage 33 through which access is had foi' supplying fuel to the fire through a door opening 34: in the casing. Lateral openings 35 in the side walls of thispassage, see Figs. 1 and 3, communicate with an vannular radiator 36 through which the com-- bustion gases normally travel, as indicated by the arrows, to the rear, whence they ascend through a flue 37 into a superposed annular radiator 37 and flow forward to ascend through another flue 38 into a like radiator 3S) above, see Figs. 1 and 4, from which the gases escape by a smoke pipe 40 to a chimney. The radiator 36 is inthe form of a hollow drum with a conical inner wall 36. Said wall 3G is parallel with the hood 3l and is spaced from the same so that the air has an unobstructed passage between the same. When starting a fire however, a by- ,i pass flue 41 may be employed to make communication between the radiators 3G and 37 at the front and immediately7 below the flue 38 whereby a more direct travel is had and the flow correspondingly increased such as to facilitate the rapid generation of heat so that the draft thus created will suffice to cause the free fiow of gases in the before explained backward and forward course through the radiators when the by-pass flue is closed by a damper 41 provided.

Secured to the casing 10 and about its top edge is an annular trough 42 for the reception of water, and carried by this trough is the casing-cap 43 provided with an opening 44 wherethrough the trough is from time to time replenished wit-h water, and for which is provided a removable closure 45. Hot air pipes 46 are connected through openings 47 in said cap with the interior of the casing and an air supply pipe 48 is pro vided to admit air into the heater base about the ash-pit.

Passage ways 49 are provided to make connection between the radiators 37 and 39, respectively, with openings in the casing wall and cap for removing soot deposits from the radiators when cleaning the same, and rat other times these ways would be closed by doors, such as 50.

The operation of the invention may be described as follows Nhen starting a lire the upper grate member 17 is first adjusted to have its radial bars register with the bars of the grate member 12 below and the damper 41 opened, as indicated in broken lines in Fig. 1. The kindling and other fuel is then placed in the fire-pot and the lire started and when sufliciently brisk to indicate an effective draft being created in the chimney the damper is closed, whereupon the combustion gases take the course represented by the arrows in the several views. The fire is allowed to continue to receive air through the grate for some time or until the lire has thoroughly heated the entire charge of fuel so that the air passing through the fuel will commingle and assist the rise of the combustion gases being liberated by heat and when such a mixture arrives in the chamber within the hood it is in an inflammatory condition and uniting with the air which is admitted through the tubular member Q8, is consumed. This con dition is allowed to proceed but a short while when the grate member `17 is manipu# lated to reduce the openings through which air would pass through the grate and the ma]- or portion of the air for combustion is admitted through the said tubular member.

According to such conditions, the fuel burns Ythrough the pipe 48 or as heretofore explained and being acted upon by the heat radiated from the various hot surfaces with which it contacts ascends into the space beneath the casing'cap 43 whence .it is distributed through the pipes 46 to the places where employed. 1n thus flowing from the casing the heated air tra-verses the trough 4'2 and takes up moisture to temper the air prior to its delivery. As is evident from an inspection of the drawings, the air in its movement from the supply `pipe 48 tothe delivery pipes 4G flows over and about the various surfaces of the apparatus from which it'derives its heat.

By reason of the fact that the hub 18 of the grate member 17 depends from the plane of the said grate member and passes through the hub portion of the grate member 14 the hub 18 serves as a gudgeon in the bearing provided in the hub of the grate member 14, whereby the member' 17 may be readily rocked when it is desired to shake down the ashes. Also, the said hub does not project above the plane of the grate member 17, and consequently presents no obstruction .to the free use of a poker above the member 17 for the purpose of loosening up ashes. Also ythe hub 18 affords a socket or seat for the tubular member' 28, and the said member 28 partially rotates with the grate member 17 and, consequently, breaks down the bank ofv ashes at the middle ofthe bed of coals. v1nasmuch as the lower end of the tubular member 28 opens directly into the ash-pit air is conducted from the ash-pit up through the center of the grate members andthe bed of coals and is liberated in the combustion Zone above the bed of coals. This has the effect of preventing an excessive draft of air from passing up directly through the coals, asthe surplus air will pass up through the tubular member 28 and enter the combustion Zone. Thus it docs not necessarily follow that the coals must be supplied with an excessive draft of air to keep them alive, and at the same time supply the proper' column of air to the products of combustion.

Having described my invention what 1 claim as new and desire to secure by Letters Patent is 1n a furnace, a grate member having a depending hub, e tubular member fixed in said hub and provided with openings at its upper and lower ends, und a second grate member having a hub portion n which the hub of the first said grate member is jonrnaled.

n testimony that I claim the foregoing as my own, I have hereto aHXed my signature 1n the presence of two Wltnesses.

FRANK S. LANG.

/Vtnesses PIERRE BARNES, E. H. ALVoRD. 

